1. A reference to something which is done randomly: Bill's aleatoric choices of words resulted in a confusing rendition of his lexicographic report to his fellow linguistic students.
2. Characterized by chance, often in reference to art or music: Frederic's performance involved aleatoric choices of notes rather than a fixed score.

alethic

Relating to the philosophical concepts of truth and possibility and especially to the branch of logic that formalizes them.